RPN Calculator Addition

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As a user, I want to be able to add two numbers so that I don't have to do the work manually

UAT

  • [] 8 <enter> 5 <plus> -> [13]
  • [] 8 <enter> <plus> -> [8]
  • [] 8 <plus> -> [8]
  • [] -3 <enter> 7 <plus> -> [4]
  • [4, 5, 3] <plus> -> [4, 8] <plus> -> [12] <plus> -> [12]

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